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How long can you sustain riding at 90% HRM?
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04-12-07 | 01:53 AM
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Mr.Mavic
Umm...
Joined:
Jan 2007
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313
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From:
Naperville/Macomb IL
Bikes:
Waterford SR33, Sram Force, Bontrager Aeolus 6.5
Random side note:
Research has show that the 220-age thing is often 10-15 beats off.
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